Fracturing process for low permeability reservoirs employing...

Details Fracturing process for low permeability reservoirs employing... Fracturing process for low permeability reservoirs employing...

E - Fixed Constructions

21

B

31/14

E21B 43/26 (2006.01) C09K 8/64 (2006.01) E21B 43/267 (2006.01)

Patent

CA 1268325

FRACTURING PROCESS FOR LOW PERMEABILITY RESERVOIRS EMPLOYING A COMPATIBLE HYDROCARBON-LIQUID CARBON DIOXIDE MIXTURE Abstract A method is described for fracturing a subterranean formation penetrated by a wellbore. A fracturing fluid in the form of a mixture of liquid carbon dioxide and a liquid hydrocarbon component of specific characteristics is injected down the wellbore under pressure to cause fracturing. The hydrocarbon component contains at least 70 wt. % of C5-C14 constituents and at least 8 wt. % aromatics and has an average molecular mass of less than 200, a pour point of less than -40°C and a density of from 0.77 to 0.85 g/ml at 15°C. This hydrocarbon component provides a higher viscosity than the liquid carbon dioxide at lower temperatures and is also an excellent solvent, simplifying clean-up. The novel fracturing fluid may also contain the usual proppants.

551804

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